BIO210Y5 Lecture Notes - Muscularis Mucosae, Somatostatin, Pectoralis Minor Muscle
Document Summary
Blood vessels: are classified by size and histological organization, are instrumental in overall cardiovascular regulation. The tunica media (middle layer: contains concentric sheets of smooth muscle in loose connective tissue, binds to inner and outer layers, external elastic membrane of the tunica media. Capillaries are the smallest blood vessels: anchors vessel to adjacent tissues in location of exchange between blood and interstitial fluid. The largest blood vessels: attach to heart, pulmonary trunk carries blood from right ventricle, to pulmonary circulation. Aorta: carries blood from left ventricle, to systemic circulation. The smallest blood vessels: capillaries have small diameter and thin walls. Chemicals and gases diffuse across walls: the structure of vessel walls. Tunica externa: the tunica intima (inner layer) Internal elastic layer in arteries, is a layer of elastic fibers in outer margin of tunica intima arteries. Smooth muscle cells: vasa vasorum ( vessels of vessels ) Supply cells of tunica media and tunica externa.
